A new law has been approved by the department of energy.
As of May 1, 2013 80% Non weatherized furnaces will no longer be sold or installed. The new law is 95% and above.I am under the understanding that ACCA tried to fight this and wrote a letter stating that this is not right and all applications will be right for installation of 95% furnaces like attic, crawlspaces , etc. But no action was taking and they passed it anyway.
This will force everyone to have to purchase a High Efficient furnace which could double the cost of just a standard furnace.
Some states are not required but as far as I know Utah, Colorado, Idaho and some others are.
On January 1, 2015, the new law will require 14 Seer and above on all A/C Units.
I will update you on any new info I hear and provide you the info of where I got this information.